| 
      
        |  | Region |  |  |  
        |  | south-western | south -    eastern | Total | p value |  
        | Genotypes |  |  |  |  |  
        | wt/wt | 213 (79.5%) | 204 (81%) | 417(80.2%) | 0.12 |  
        | wt/del32 | 48 (17.9%) | 47 (18.6%) | 95 (18.3%) |  
        | del32/del32 | 7 (2.6%) | 1 (0.4%) | 8 (1.5%) |  
        | Total | 268 | 252 | 520 |  |  
        | Alleles |  |  |  | 0.33 |  
        | del32 | 62 (11.6%) | 49 (9.7%) | 111    (10.7%) |  
        | wt | 474    (88.4%) | 455    (90.3%) | 929    (89.3%) |  
        | Total | 536 | 504 | 1040 |  |  |